Logistics are mostly the same, get crowds in and out safely and supply food and drink etc. Only difference is the supports the teams require and there's different dressing rooms on opposite sides for the different codes. Both can be made ready at the same time. A bit more crap on the sides of the pitch for NFL as well, isn't a big deal to add/remove. Definitely no prob doing it a day apart.I think that was just marketing speak during the stadium build. They might look to do events closer together in the future but I cannot see it next season. The logistics go a lot further than switching pitches and the operation for an NFL game is a lot bigger than it is for PL football and has a bigger impact on the local community.
Either way I wouldn't make my plans based on the days that the NFL games have been announced for and wait for confirmation.